Was it George Zimmerman or Trayvon Martin who screamed for help the night the 17-year-old Martin was shot dead?
That could depend on which mother the jury believes.
Both Zimmerman's and Martin's mothers expressed no hesitation Friday in separate court appearances as to whose panicked voice is heard screaming during a 911 call from that February 26, 2012, night in Sanford, Florida: Each said it was her son.
That contradiction -- with Sybrina Fulton insisting it was her son, Trayvon, who cried out, while Gladys Zimmerman said it was her son, George, who was yelling after being attacked by the teen -- was central to Friday's court proceedings, and central to the second-degree murder case unfolding in central Florida.
Zimmerman has pleaded not guilty and claimed he shot the teenager in self-defense. The 911 call played twice in court on Friday, his lawyers claim, back up their assertion that it was Martin, and not their client, who was the aggressor.
Testifying late Friday afternoon, Gladys Zimmerman said she was sure George was the one yelling. Why?
"Because he's my son."
She answered "all of the above" when asked whether she had ever before heard her George Zimmerman laugh loudly or cry out for help. This instance, though, Gladys Zimmerman admits was different.
"I haven't heard him like that before," she said as her son wiped away tears in the courtroom. "The anguish, the way that he is screaming it describes to me anguish, fear, I would say terror."
Contrast that to the very different story offered a few hours earlier by Sybrina Fulton, who was stoic as prosecutor Bernie de la Rionda played the 911 call.
When asked whether she recognized the screaming voice, the mother -- who earlier stated that her son was "in heaven" -- said it was that of "Trayvon Benjamin Martin."
Defense attorney Mark O'Mara followed up by asking her, "As his mother, there was no doubt it was him screaming?"
She replied: "Absolutely."
O'Mara then raised the possibility her son, not Zimmerman, was to to blame. "You certainly hope, as a mom, that your son Trayvon Martin would not have done anything that led to his death, correct?" he asked.
"What I hoped for," said Fulton, "is that nothing happened and he'd still be here. That's my hope."
Parents' comments pivotal, or do they cancel each other?
More than a year ago, the tale of what happened between Trayvon Martin and George Zimmerman captured the nation's attention and shone a spotlight on gun laws as well as race -- given that Martin is African-American, while Zimmerman is Hispanic.
Moreover, the case prompted some to question Florida's "Stand Your Ground" law, which gives a person facing a "presumption of fear of death or great bodily harm" extra protections should they respond with force instead of retreat. Ultimately, Zimmerman chose not to utilize that specific defense.
The trial kicked off nearly two weeks ago with impassioned opening arguments.
The prosecution suggested Zimmerman, whom they painted as a neighborhood watch volunteer who overstepped his bounds, had "profiled" Martin because he was black. They called to the stand the 911 dispatcher who told Zimmerman not to follow Martin, though he did anyway. Then there were crime scene and autopsy photos.
And of course, there was the testimony of Rachel Jeantel, who said she'd been on the phone with her friend Trayvon Martin in the minutes before his death. She testified that she'd heard Martin call out, "Why are you following me for?" and then say, "Get off," before their call was cut off.
Jeantel has been described as the defense's star witness. That may still be true. But in many ways, Friday was the most emotional and potentially pivotal day in the trial to date.
O'Mara isn't disputing that latter assertion. He told CNN's Brooke Baldwin on Friday night that "once the jury decides who was screaming for help (on the 911 call), if they can, I think everything else falls in line."
Speaking to CNN, O'Mara says he doesn't dispute that Fulton genuinely believes it was her son's voice. But so does Gladys Zimmerman of her own son, the defense lawyer says, arguing that "all the other evidence would suggest" that the screaming voice is indeed that of George Zimmerman.
And even if not everyone sees it that say, O'Mara opined, it's possible each woman's testimony may cancel each other out.